The sales representative for Crazy Clocks has just told you that your new order of clocks will cost you $27.79 each instead of $20.91 each. The manager tells you that she has decided to handle the increase in cost by continuing to employ the same 49% RMU as before, thereby increasing the retail price. To retail all the clocks at the same price, the additional markup that you must add to each of the clocks that are in stock already is $__________?